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符号三角形

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4386    Accepted Submission(s): 1851


Problem Description
符号三角形的 第1行有n个由“+”和”-“组成的符号 ,以后每行符号比上行少1个,2个同号下面是”+“,2个异 号下面是”-“ 。计算有多少个不同的符号三角形,使其所含”+“ 和”-“ 的个数相同 。 n=7时的1个符号三角形如下:
+ + - + - + +
+ - - - - +
- + + + -
- + + -
- + -
- -
+
 

Input
每行1个正整数n <=24,n=0退出.
 

Output
n和符号三角形的个数.
 

Sample Input
15 16 19 20 0
 

Sample Output
15 1896 16 5160 19 32757 20 59984
 

Source
 

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